.fl{
    float: left;
}
.fr{
    float:right;
}
/* 版心 */
.w{
    width: 413px;
    margin: auto;
}
.header {
    /* margin-top:20px; */
    height: 40px;
    position: fixed;
   /* top:10px; */
    background-color:rgb(255,255,255);
    line-height: 40px;
    text-align: center;
    border-bottom: 1px solid rgb(0,0,0,0.5);
}
.box1,.box3{
    width: 20%;
}
.box2{
    width:60%;
    
}
.box1{
    font-size: 12xp;
}
/* 底部 */
.button{
    /* height: 50px; */
    position: fixed;
    background-color:rgb(255,255,255);
    /* line-height: 50px; */
    text-align: center;
    border-top: 1px solid rgb(0,0,0,0.5);
    /* margin-top: 20px; */
    /* font-size: 10px; */
    padding-top: 5px;
    top:calc(100vh - 50px);
    
}
.box4{
    /* height: 50px; */
    width: 33%;
    /* margin-top: -10px; */
}
.box4 p{
    height:25px ;
    font-size: 12px;
}
.box4 i{
    height:25px ;
}
/* 100vh是屏幕高度 */
.content{
    margin-top: 40px;
    padding-bottom: 10px;
    height:calc(100vh - 90px); 
    overflow-y: scroll;
}
.box5{
    margin-top: 5px;
    margin-left: 5px;
    width: 199px;
    height: 250px;
    border: 1px solid black;
    border-radius: 5px;
}
.box5 img{
    width: 100%;
}
.box5 h3{
    font-size: 14px;
    white-space: nowrap;
    overflow-x: hidden;
    text-overflow: ellipsis;
}
.box5 span{
    color:orangered;
}
.tools{
    width: 120px;
    height: 30px;
    background-color: #000;
    color: #fff;
    position:fixed;
    left: -620px;
    top: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    border-radius: 10px;
    text-align: center;
    line-height: 30px;
     display: none; 
  }
  
  .backTop{
    position: fixed;
    left: 200px;
    bottom: 80px;
     display: none; 
  
    
  }
  
  .backTop i{
    font-size: 50px;
  }